Synthetix Interactive no longer exists. Their former members have created a new company.Sticky Studios (http://www.stickystudios.com)You can ask at their forums if they are willing to publish that tutorial again.

Ok, the Sticky Studios guys were kind enough to allow reprinting the tutorial, so if anyone ever needs it again, you'll find it in WME Wiki (http://wiki.dead-code.org/wakka.php?wakka=ColoringTutorial).